Why gutters matter more than most people think

Gutters are the least glamorous part of any home, and the one that quietly protects everything else. A single blocked outlet can send water over the edge of the gutter and straight down the face of your wall, where it soaks into brickwork, works behind render and finds its way into the cavity. Over a winter that shows up as damp patches, blown plaster and mould in the corner of a bedroom ceiling. Over several winters it can undermine the footings themselves, particularly on clay soils that shrink and swell as moisture levels change.

If you live on a slope, the stakes are higher. Water you fail to collect at roof level runs downhill, across the garden, and gathers wherever the ground levels out — often against the back wall of the house or the base of a retaining wall. Gutters and downpipes are the first line of defence, and they reward half an hour of attention twice a year.

Know your system before you start

Most UK homes have uPVC guttering, typically a 112mm half-round or a 114mm square profile, feeding 68mm round downpipes into a gully, hopper or soakaway. Older and higher-end renovations often use cast iron, and some newer self-builds use aluminium or steel. The material decides the fixing, the fall and the maintenance.

• uPVC: brackets roughly every 600mm for gutters, no more than 2m apart on downpipes. It expands and contracts in the sun, so joints need a small allowance for movement and a flexible gutter sealant rather than a rigid fill.
• Cast iron: brackets can be spaced further apart, but the joints and the paint finish are what keep it alive. Recoat with a suitable metal paint as part of your summer jobs, and check every bolted joint for weeping.
• Aluminium and steel: usually powder-coated, so avoid abrasive pads and solvents. A soft brush and warm soapy water is all they need.

Cut an effective roof area calculation before you change anything. A gutter that overflows in a downpour is often undersized rather than blocked, especially where a renovation has added a dormer, extension or larger roof plane to the original drainage.

Spring and summer: repair, realign, reset falls

Spring is your damage assessment after winter. Look for cracked gutter lengths, pulled brackets, sagging runs and downpipes that have shifted at the shoe. Birds nest in hoppers and downpipes surprisingly often, and a nest discovered in May means a blocked pipe discovered in October.

Summer, when the system is dry and light, is the right time to check the fall. Gutters should run towards the outlet at roughly 2–3mm per metre — enough to move water, not so much that the gutter looks visibly crooked against the fascia. Run a string line along the gutter or use a long spirit level, then slacken and reset the brackets. On long runs, a running outlet every 10–12 metres keeps water from travelling too far and pooling.

Reseal any joint that shows staining beneath it. Push-fit joints that have been sealed with nothing at all will drip in a heavy shower, and the drip usually lands exactly where you don't want it — on a path, a doorstep or a freshly pointed wall.

Autumn: the main event

Clear the gutters once the bulk of the leaves are down, and once more after the last of them fall, before the first named storm of the season. A glove and a scoop is faster and safer than trying to flush everything down the pipe. Then rod or flush the downpipes from the top with a hose, checking that water arrives freely at the bottom.

• Fit leaf guards or hedgehog-style brushes on runs beneath trees, but remember they still need clearing.
• Check hopper heads — a surprising amount of debris collects behind them.
• Clear gully gratings and the channel drains at the bottom of drives and slopes before winter silts them up.
• If you have a water butt, make sure the overflow discharges properly to a drain or soakaway rather than quietly soaking the wall base.

Winter, storms and sloped-garden drainage

After any severe storm, walk the perimeter and check for displaced lengths, missing brackets and downpipes that have been knocked off by a falling branch. Frost is hard on cast iron and on any joint already holding water, so a hairline crack in November becomes a split by January.

Where the ground falls away from the house, think about where the water actually ends up. A downpipe discharging onto a slope will carve a channel and wash soil towards the lowest point. Better options are a properly sized soakaway — kept well clear of the building and any retaining structure — a rain garden planted with moisture-loving species, or a shallow swale that carries water to a safe outlet. Building regulations on drainage in England and Wales set out the priorities here, and a soakaway sized for the roof area will save you a great deal of grief later.

A simple seasonal routine

• Spring: inspect for winter damage, clear nests, touch up cast iron paint.
• Summer: check and reset falls, tighten or replace brackets, reseal joints.
• Early autumn: clear gutters and downpipes, fit leaf guards, clear gullies.
• Late autumn and winter: repeat the clear-out, then inspect after every major storm.

Work from a stable ladder with a standoff that keeps it off the gutter itself, never alone if you're unsteady at height, and avoid leaning out to reach a stubborn corner. It's a small, dull job that protects the whole structure — and on a sloping site, it's the cheapest drainage work you'll ever do.